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(No Model.)

P. W. JONES.

STATIC OOMPENSATOR FOR TELEGRAPHS. No. 300,781. Patented June 24, 1884.

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MTE STATES. A NI FFIQE.

FRANCIS WV; JONES, OF NEW YORK, N. Y.

STATIC COMPENSATOR FOR TELEGRAPHS.

SPECIFICATION forming part of Letters Patent No. 300,781, dated June 24,1884.

Application filed September 7, 1883. (No model.)

To all whom it may concern.-

Be it known that I, FRANCIS W. J ONES, a citizen of the United States,and a resident of New York, in the county of New York and State of NewYork, have invented certain new and useful Improvements in StaticCompensators for Duplex and Multiplex Telegraphs, of'whieh the followingis a specification.

'My invention relates to duplex or multiplex telegraphs, and is.designedto afford a simple and effective device for neutralizing or compensatingfor the disturbing effects upon the home relay, due to the differencebetween the main and the artificial lines in respect to static chargeand discharge. It is well known in the art that at the moment thesignaling battery or generator at the home station is put to line thereis a momentary want of balance between'the main and artificial lines,owing to the greater charge capacity of the main line, although afterthe current is established no want of balance is observed, provided theproper adjustments of resistance have been made, and thereceiving-instrument at the home station is not affected by the outgoingcurrent. The momentary want of balance may, however, produce a falsemovement of the home relay. Similarly, when the signalingbattery iswithdrawn, the discharge-current from the line is liable to produce afalse signal,

owing to the fact that its strength is greater than that of thedischarge from the artificial line, and there is therefore at such timealso a want of balance. I propose to avoid the disturbing effects of thestatic charge and discharge by means of a neutralizing or compensatingcoil arranged to exert an efiect upon the receiving-instrument counterto that consequent upon the static charge and discharge of the line, andconnected with the secondary of an induction-coil or inductorium, theprimary of which latter is connected into the line-circuit in such a waythat when the signaling -battery is placed to line its current will flowthrough the primary and set up a current in the secondary in onedirection, while, vice versa, when the signaling;battery is withdrawn,its current will cease to flow in the primary, and thus cause amomentary induced current in the secondary in the opposite direction.The static charge and discharge tion.

' currents of the main line being respectively an ordinary duplextelegraph. Its mode of application to other forms of multiplextelegraph-such as the quadruplex, &c.will be obvious without furtherexplanation.

In the drawings, Figure 1 is a diagram illustrating the circuits andarrangement of apparatus at one end of a \Vhcatstone-bridge duplex. Fig.2 illustrates the application of the invention to an ordinarydifferential duplex.

Referring to Fig. 1, T indicates an ordinary continuitypreservingtransmitter, operated by an electro-magnet in circuit with a localbattery, L B, and a Morse key, K, in the usual manner; and M B, themain-line or signaling battery, which is alternately applied to andwithdrawn from line, in the usual way, by the operation of thetransmitter.

B indicates the ordinary artificial resistance placed in the ground-wireor back contact connection of the transmitter, and approximately equalto the resistance of the battery M B.

At R It R are indicated the usual adj ustable resistances placed in thebranches of the Wheatstone bridge for the purpose of producing a balancebetween the main and artificial lines in the well-known manner, so thatthe receiving relay or instrument in the bridgewire B shall not beaffected by the action of the battery M B. The local sounder for thereceiving-relay is indicated at S, while 0 indicates the coils proper ofthe relay, which coils are in the bridge-wire, and receive currentflowing over the line L from the distant sta- Upon the relay is placedan additional set of coils, D, wound in a bobbin placed upon the core ofthe relay and beside the coils to the relay, so that a current flowingin the coils D in proper direction may tend to produce an oppositeeffect to that produced by coils (l, and may thus, under certainconditions, neutralize or counteract the effects of the latter. Coils Dare in a local circuit with the secondary of an inductorium orinductioncoil, 1, and the primary coils of the latter are, as indicated,in the circuit of the main-line battery M B, so that when the latter isput to line its current will flow through the primary coil and induceacurrent in one direction in the secondary coil, and when said main-linebattery is withdrawn from line the cessation of its current in theprimary coil will cause an induced current in the secondary coil in theopposite direction. The proper ends of the coils D are connected to thesecondary of the inductorium, so that the current induced in thesecondary by the placing of the main-line battery to line shall exert aneffect upon the receiving-relay at the home station counter or oppositeto that which would be exerted by any current flowing at the same timein the bridge-wire by reason of the difference in static capacitybetween the main and artificial lines. The core M of the induction-coilis made adjustable in and out of the coils, so that the induced currentmay be adjusted according to the strength of the static charge ordischarge current flowing in the bridge B.

The general operation is as follows: When the main-line battery is putto line, there is at the moment of closing a momentary flow ofbattery-current in the bridge, owing to the difference in the staticcapacity of the main and artificial lines; but simultaneously there isinduced in the secondary of the induction-coil a current whichcirculates in the coils D in proper direction to neutralize the effectsupon the relay of the current flowingin the bridge-wire B. The relay,therefore, is unaffected, and no false signal is produced. When thecurrent is fully established on both main and artificial lines, thebalance is complete, owing to the adjustment of the resistance R R R,and the current divides between them in the usual way, without affectingthe relay. Vhen the current of M B isL withdrawn from line, there is astatic-discharge current from line L, which flows in the bridge-wire Bin the opposite direction to that flowing when the battery is put toline, and this discharge-current would produce a false signal were itnot that the withdrawal of the main-line battery also sets up in thesecondary of the induction coil and coils D a current of the oppositepolarity from that produced by the closing of the battery, and thereforeof the proper direction to neutralize the effects of thestatic-discharge current by producing counter effects upon the relay.

I do not limit myself to any particular method of causing the currentset up in the secondary to act upon the relay in opposition tothe staticcharge or discharge current, and may apply the coil in other ways forthis purpose without departing from the spirit of the invention. Onesuch way is illustrated in Fig. 2, in which the magnetizing efl'ects ofthe coil D are applied to a separate c'ore instead of the relay-core,and are made to exert a counter pull upon the relay armature-lever whenthe static charge or discharge current tends to draw the latter off itsstop. This figure also illustrates the application of my invention to adifferential duplex.

R indicates an ordinary diiferentiallywound receiver, one of its coilsbeing in the main line L, and the other oppositely wound or connectedcoil in an artificial line through the rheostat R.

H indicates the armature-lever of the relay. The core ofcompensating-coil D acts on said lever in a contrary direction to therelay-core, and said core is energized at the proper times by theinduced current from the coil I, produced simultaneously with theconnection and disconnection of the battery M B, and with the action ofthe static-charge and' static-discharge current.

I am aware that it is not new to place a coil and core in the mainlinecircuit and to employ the discharge from such coils produced by themagnetization and demagnetization of its core for meeting andneutralizing the static charge and discharge current in the line, asthis was proposed by C. F. Varley'in 1870. My device difl'ers therefromin that the dischargecurrent produced by the main-line batterycirculating in magnet-coils placed in the main line is not made tocirculate in the line as previously, but through the medium of thesecondary coils is made to flow in a local or independent circuit, andis made to act in an auxiliary or compensating coil, instead of flowingin the main line in a direction opposite to that of the static chargeand discharge current.

I am also aware that it is not new to employ the secondary current froman inductioncoil for purposes of compensation; but in no instance ofwhich I am aware has the primary been arranged and operated in themanner devised by me and herein shown, and

so that the signaling-current transmitted by the closing of thesignaling-key will flow in the primary, and so that the efl'ects in thesecondary will be commensurate with and will be automatically adjustedto the strength of said signaling-current, and will vary automaticallytherewith.

What I claim as my invention is- 1. A static compensator for duplex ormultiplex telegraphs, consisting of an inductorium one coil of which isin the circuit, as described, with the signaling-battery and the line,so that the signaling-current sent by the transmitter will flow throughsaid coil, while the other is in a local circuit, including means forcounteracting the disturbing effects of the static charge and dischargecurrent upon the receiver.

2. A static compensator for duplex or multiplex telegraphs, consistingof an inductorium one coil of which is connected directly into thesignaling-circuit, so as to be charged and discharged by the alternateflow and removal of signaling current transmitted to line at everycomplete movement of the transmitter, while its other coil includes aneutralizing-coil applied to the receiver, so as to counteract theeffects of the static charge and discharge current flowing in the coilsof said receiver.

3. The combination, with the receiver, in a differential or bridgeduplex or multiplex telegraph, of an auxiliary coil adapted to exertupon said receiver an effect counter to that of the static charge ordischarge current, and an induction-coil whose secondary includes such I5 York and State of New York, this 25th day 20 of August, A. D. 1883.

' FRANCIS W. JONES.

Witnesses:

THOS. TOOMEY, Gno. O. OOFFIN.

